ESA's Biopan 1--"Vitamin" experiment preliminary results

The purpose of “Vitamin” experiment is to study the efficiency of protective substances on three biological acellular systems aqueous solutions exposed to cosmic radiation in space. The first system “LDL”is a low density lipoprotein. The second is “E2-TeBG complexe” in which estradiol (E2) is bound to its plasmatic carrier protein, testosterone-estradiol binding globulin (TeBG). The third is “pBR 322”, a plasmid. “Vitamin” experiment was accomodated in the Biopan which had been mounted on the outer surface of a Foton retrievable satellite. The experiment was exposed to space environment during 15 days. A stable temperature of about 20 °C was maintained throughout the flight. “Vitamin” experiment preliminary results are presented and discussed.     

MX第一级

1980年在 Montery 召开的 JANNAF 会议上,介绍了 MX 第一级原始方案论证及制订的研制方案。这篇新资料评论了最初的两次静态试验所取得的结果。     

Loading effects on rat craniomandibular morphology: a system for gravity studies

Gravity effects on muscle and bone are a major impediment to long-term space travel. We introduce a model for studying these effects, the craniomandibular system. Some advantages of this system include: (1) craniomandibular morphology is determined by epigenetic factors including gravity, (2) relatively light forces can significantly alter its morphology, and (3) soft diet and tooth loss produce effects that are similar to those produced in lower limbs by weightlessness. In the study, implants made either of gold (experimental group) or lightweight acrylic (controls) were attached to adult rats' mandibles. After 13 weeks, the animals' skulls and mandibles were dissected. Pair-wise comparisons indicated that the experimental animals showed significantly shortened and narrowed cranial bases, and significant changes in the posterior zygomatic arch region. These results indicate that simulated macrogravity influences bone remodeling in the adult craniomandibular system.     

冲击响应谱计算相关参数选择的研究

国军标GJB2238A-2004《遥测数据处理》的附录K对冲击响应谱的计算方法和阻尼系数做了明确规定, 但未明确其它参数如何选择。文中以半正弦波的冲击响应谱为例,导出了冲击响应谱分析时选择其它相关参数的原则。     

固体火箭发动机试验故障分析

从工程研制角度出发，探讨了分析固体火箭发动机试验失败原因的一般方法和过程，根据某发动机试验故障的具体情况，运用这种试验故障分析方法和过程（即针对试验故障进行故障树分析，设计复审分析，数据曲线的复核复算分析和验证试验），找出造成发动机试验故障的具体原因，确定故障机理；而后针对性地采取综合技术措施，并对这些措施进行试验验证，故障归零。     

螺栓挤压推力终止系统验证试验

本文总结了螺栓挤压推力终止系统(BETTS)的设计、研制和验证试验。该系统在阿诺德工程研制中心(AEDC)进行了多次冷试,一次海平面热试和两次高空点火推力终止试验,试验所用的发动机是政府向化学系统分公司提供的“民兵”发动机空壳体装药后制成的。通过大发动机热试,证明本计划所验证的这种BETTS可以消除前部碎片,大大地简化药柱和发动机壳体的设计,提高末级性能。另外,这种方法设计简单,从而可以降低推进系统的成本。BETTS用爆炸螺栓和挤压螺栓的组合代替连接喷管法兰和发动机壳体法兰的普通螺栓。接到指令后,爆炸螺栓立即打开,喷管循着挤压螺栓向后平移,发动机气体迅速排出,从而使推进剂熄火。挤压螺栓控制着喷管的移动速度和最大运动行程。以前根据NO.F04611—75—C—0044合同(CSD计划2549)曾成功地在缩比发动机上进行了BETTS热试和在飞行重量的“民兵”Ⅲ第三级发动机上进行了冷试。     

HTPB推进剂的老化及使用寿命

为了进行老化评价研究,选择和研制了三种不同固体含量的(88～91%)端羟基聚丁二烯(HTPB)推进剂。已经证实,88%固体含量的HTPB推进剂符合以前提出的老化模型。这种老化模型已成功地进一步用于较高固体含量的推进剂以及其它计划用的HTPB推进剂的实测力学性能老化数据。采用这种老化模型,根据加速热老化试验数据予测了长期力学性能,予测数据与六年实测老化数据相当一致。利用予测的推进剂破坏性能,结合火箭发动机的要求,来确定予先选定安全裕度的发动机药柱的使用寿命。本文列出了各种复合推进剂老化速率的比较数据。根据老化结果的分析,提出了一个宽范围老化行为的数学表达式。     

The Suess-Urey mission (return of solar matter to Earth)

The Suess-Urey (S-U) mission has been proposed as a NASA Discovery mission to return samples of matter from the Sun to the Earth for isotopic and chemical analyses in terrestrial laboratories to provide a major improvement in our knowledge of the average chemical and isotopic composition of the solar system. The S-U spacecraft and sample return capsule will be placed in a halo orbit around the L1 Sun-Earth libration point for two years to collect solar wind ions which implant into large passive collectors made of ultra-pure materials. Constant Spacecraft-Sun-Earth geometries enable simple spin stabilized attitude control, simple passive thermal control, and a fixed medium gain antenna. Low data requirements and the safety of a Sun-pointed spinner, result in extremely low mission operations costs.     

The effect of head-down tilt on brain potentials related to visual attention

To study the possible effect of simulated weightlessness on brain function state, the brain event-related potentials (ERPs) in a simple visual selective response task were compared between HDT and HUT in 9 normal subjects. The results were: The Target(T) and non-Target(NT) flash signals both induced significant slow positive potentials which were supposed to related to the attention state; the amplitude of the positive potentials in frontal regions decreased significantly especially for NT-ERPs during HDT comprared with that during HUT. The data reported provide new evidence indicating that more attention should be paid on the brain function study during space flight.     

非硅氧化物的滤出及其机理探讨

 采用B核磁共振仪,激光拉曼光谱仪,隧道扫描显微镜及各种化学分析等方法,较系统地研究了沥滤温度、时间和酸液浓度对拉制的钠硼硅玻璃纤维纯度的影响。结果表明,高钝超细SiO_2,纤维可以用酸沥滤法获得;揭示了纤维中非硅氧化物沥出的规律;并初步探讨了沥滤机理,认为沥滤过程主要是B~(3+)和N~+与H~+发生交换扩散的过程。